User:Jci2297/Quasi critical number

Quasi critical number is a differential calculus term coined by Mississippi State University mathematics department graduate student, Jerome Goddard Jr. A quasi critical number is an x value for a function at which the second derivative of the function is equal to zero or does not exist. A quasi critical number is used with the second derivative test to find points of inflection (changes in concavity) in the original function. In the same way that a critical number is an x value at which the first derivative equals zero or does not exist and shows where the slope of the function is either horizontal or vertical, a quasi critical number shows where there may be a change in concavity of the function.